20534821065653 has 16 divisors (see below), whose sum is σ = 22831782758400. Its totient is φ = 18388665897840.

The previous prime is 20534821065613. The next prime is 20534821065679. The reversal of 20534821065653 is 35656012843502.

It is a cyclic number.

It is not a de Polignac number, because 20534821065653 - 2¹⁸ = 20534820803509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534821065613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405368543 + ... + 405419196.

It is an arithmetic number, because the mean of its divisors is an integer number (1426986422400).

Almost surely, 2^{20534821065653} is an apocalyptic number.

It is an amenable number.

20534821065653 is a deficient number, since it is larger than the sum of its proper divisors (2296961692747).

20534821065653 is a wasteful number, since it uses less digits than its factorization.

20534821065653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810787832.

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 20534821065653 in words is "twenty trillion, five hundred thirty-four billion, eight hundred twenty-one million, sixty-five thousand, six hundred fifty-three".